package com.linc.concurrency;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

public class ImprovedList<T> implements List<T> {
  private final List<T> list;

  public ImprovedList(List<T> list) {
    this.list = list;
  }

  public synchronized boolean putIfAbsent(T x) {
    boolean contains = list.contains(x);
    if (!contains) list.add(x);
    return !contains;
  }

  @Override
  public int size() {
    return 0;
  }

  @Override
  public boolean isEmpty() {
    return false;
  }

  @Override
  public boolean contains(Object o) {
    return false;
  }

  @Override
  public Iterator<T> iterator() {
    return null;
  }

  @Override
  public Object[] toArray() {
    return new Object[0];
  }

  @Override
  public <T1> T1[] toArray(T1[] a) {
    return null;
  }

  @Override
  public boolean add(T t) {
    return false;
  }

  @Override
  public boolean remove(Object o) {
    return false;
  }

  @Override
  public boolean containsAll(Collection<?> c) {
    return false;
  }

  @Override
  public boolean addAll(Collection<? extends T> c) {
    return false;
  }

  @Override
  public boolean addAll(int index, Collection<? extends T> c) {
    return false;
  }

  @Override
  public boolean removeAll(Collection<?> c) {
    return false;
  }

  @Override
  public boolean retainAll(Collection<?> c) {
    return false;
  }

  public synchronized void clear() {
    list.clear();
  }

  @Override
  public T get(int index) {
    return null;
  }

  @Override
  public T set(int index, T element) {
    return null;
  }

  @Override
  public void add(int index, T element) {}

  @Override
  public T remove(int index) {
    return null;
  }

  @Override
  public int indexOf(Object o) {
    return 0;
  }

  @Override
  public int lastIndexOf(Object o) {
    return 0;
  }

  @Override
  public ListIterator<T> listIterator() {
    return null;
  }

  @Override
  public ListIterator<T> listIterator(int index) {
    return null;
  }

  @Override
  public List<T> subList(int fromIndex, int toIndex) {
    return null;
  }
}
